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本文对我国电视中频存在的问题作了分析,提出了在电视频道划分确定之后优选电视中频的方法,指出我国电视中频选用46.75MHz时,可以把电视接收机之间的本振信号基波及其二次谐波辐射干扰,从原来的56个频道减少到2个频道,甚至可以避免这种干揽。
This paper analyzes the problems existing in the TV intermediate frequency in our country and puts forward the method of optimizing the TV intermediate frequency after determining the TV channels. It is pointed out that when the TV intermediate frequency of our country is chosen to be 46.75MHz, the fundamental wave of the local oscillator signal between TV receivers and its second Sub-harmonic radiation interference, reduced from the original 56 channels to 2 channels, and even to avoid this dry Lan.